What does it mean if.....

[fla. keys]

On all of my powerheads and some of my live rock, I am getting alot of green long almost seaweed looking algea growing. It looksw like small plants.
I clean the tank about once every 10 days or so but this seaweed looking stuff comes back in full force?
Help.

 

[salty rick]

Sounds like green hair algae to me. That is an indication of high nitrates or high phosphates. I suggest a water test to find out. If these are high then you need to isolate the cause of the high nitrates or phosphates. Usually it is due to too much feeding or using straight tap water for water changes. Tangs, Lawnmower Blennies and hermit crabs eat this stuff and helps keep it under control.